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On Monday, we told you that T-Mobile was enhancing its 4G network in Atlanta, Seattle, and Minneapolis to provide access to its iPhone-compatible 1900 MHz spectrum for more users. Chief Technology Officer for T-Mobile USA Neville Ray announced more enhancements to the network today, including the roll out of more iPhone-compatible 4G HSPA+ to five major metro areas, such as: Chicago; Reno, Nev.; and Fresno, Sacramento and Southern Calif.

A spokesperson confirmed to us that the launch of the enhanced network in these new areas brings T-Mobile’s total covered for iPhone compatible 1900 MHz PCS spectrum to 100 million people.

T-Mobile also said more enhancements to the network are on the way to “Boston, Chicago, Los Angeles, the New York metro area, Philadelphia, and San Diego,” with many customers already experiencing unlocked iPhone “speed sightings.”